From 88698c156ffe567885f154c80270db962d29e82b Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Sat, 17 Mar 2018 17:06:23 -0500
Subject: GPU: Store shader constbuffer bindings in the GPU state.

---
 src/video_core/engines/maxwell_3d.cpp | 38 +++++++++++++++++++++++++++++++++--
 src/video_core/engines/maxwell_3d.h   | 28 +++++++++++++++++++++++---
 2 files changed, 61 insertions(+), 5 deletions(-)

diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index 4b15ed2f2..50153eff3 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -43,6 +43,26 @@ void Maxwell3D::WriteReg(u32 method, u32 value) {
         ASSERT_MSG(regs.code_address.CodeAddress() == 0, "Unexpected CODE_ADDRESS register value.");
         break;
     }
+    case MAXWELL3D_REG_INDEX(cb_bind[0].raw_config): {
+        ProcessCBBind(Regs::ShaderType::Vertex);
+        break;
+    }
+    case MAXWELL3D_REG_INDEX(cb_bind[1].raw_config): {
+        ProcessCBBind(Regs::ShaderType::TesselationControl);
+        break;
+    }
+    case MAXWELL3D_REG_INDEX(cb_bind[2].raw_config): {
+        ProcessCBBind(Regs::ShaderType::TesselationEval);
+        break;
+    }
+    case MAXWELL3D_REG_INDEX(cb_bind[3].raw_config): {
+        ProcessCBBind(Regs::ShaderType::Geometry);
+        break;
+    }
+    case MAXWELL3D_REG_INDEX(cb_bind[4].raw_config): {
+        ProcessCBBind(Regs::ShaderType::Fragment);
+        break;
+    }
     case MAXWELL3D_REG_INDEX(draw.vertex_end_gl): {
         DrawArrays();
         break;
@@ -95,11 +115,10 @@ void Maxwell3D::SetShader(const std::vector<u32>& parameters) {
     auto shader_type = static_cast<Regs::ShaderType>(parameters[3]);
     GPUVAddr cb_address = parameters[4] << 8;
 
-    auto& shader = state.shaders[static_cast<size_t>(shader_program)];
+    auto& shader = state.shader_programs[static_cast<size_t>(shader_program)];
     shader.program = shader_program;
     shader.type = shader_type;
     shader.address = address;
-    shader.cb_address = cb_address;
 
     // Perform the same operations as the real macro code.
     // TODO(Subv): Early exit if register 0xD1C + shader_program contains the same as params[1].
@@ -118,6 +137,21 @@ void Maxwell3D::SetShader(const std::vector<u32>& parameters) {
     // shader. It's likely that these are the constants for the shader.
     regs.cb_bind[static_cast<size_t>(shader_type)].valid.Assign(1);
     regs.cb_bind[static_cast<size_t>(shader_type)].index.Assign(1);
+
+    ProcessCBBind(shader_type);
+}
+
+void Maxwell3D::ProcessCBBind(Regs::ShaderType stage) {
+    // Bind the buffer currently in CB_ADDRESS to the specified index in the desired shader stage.
+    auto& shader = state.shader_stages[static_cast<size_t>(stage)];
+    auto& bind_data = regs.cb_bind[static_cast<size_t>(stage)];
+
+    auto& buffer = shader.const_buffers[bind_data.index];
+
+    buffer.enabled = bind_data.valid.Value() != 0;
+    buffer.index = bind_data.index;
+    buffer.address = regs.const_buffer.BufferAddress();
+    buffer.size = regs.const_buffer.cb_size;
 }
 
 } // namespace Engines
diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index c8920da50..9e28d8319 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -39,6 +39,8 @@ public:
         static constexpr size_t NumVertexArrays = 32;
         static constexpr size_t MaxShaderProgram = 6;
         static constexpr size_t MaxShaderType = 5;
+        // Maximum number of const buffers per shader stage.
+        static constexpr size_t MaxConstBuffers = 16;
 
         enum class QueryMode : u32 {
             Write = 0,
@@ -146,12 +148,18 @@ public:
                     u32 cb_address_low;
                     u32 cb_pos;
                     u32 cb_data[NumCBData];
+
+                    GPUVAddr BufferAddress() const {
+                        return static_cast<GPUVAddr>(
+                            (static_cast<GPUVAddr>(cb_address_high) << 32) | cb_address_low);
+                    }
                 } const_buffer;
 
                 INSERT_PADDING_WORDS(0x10);
 
                 struct {
                     union {
+                        u32 raw_config;
                         BitField<0, 1, u32> valid;
                         BitField<4, 5, u32> index;
                     };
@@ -167,14 +175,25 @@ public:
     static_assert(sizeof(Regs) == Regs::NUM_REGS * sizeof(u32), "Maxwell3D Regs has wrong size");
 
     struct State {
-        struct ShaderInfo {
+        struct ConstBufferInfo {
+            GPUVAddr address;
+            u32 index;
+            u32 size;
+            bool enabled;
+        };
+
+        struct ShaderProgramInfo {
             Regs::ShaderType type;
             Regs::ShaderProgram program;
             GPUVAddr address;
-            GPUVAddr cb_address;
         };
 
-        std::array<ShaderInfo, Regs::MaxShaderProgram> shaders;
+        struct ShaderStageInfo {
+            std::array<ConstBufferInfo, Regs::MaxConstBuffers> const_buffers;
+        };
+
+        std::array<ShaderStageInfo, Regs::MaxShaderType> shader_stages;
+        std::array<ShaderProgramInfo, Regs::MaxShaderProgram> shader_programs;
     };
 
     State state{};
@@ -185,6 +204,9 @@ private:
     /// Handles a write to the QUERY_GET register.
     void ProcessQueryGet();
 
+    /// Handles a write to the CB_BIND register.
+    void ProcessCBBind(Regs::ShaderType stage);
+
     /// Handles a write to the VERTEX_END_GL register, triggering a draw.
     void DrawArrays();
 
-- 
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